linux-kernel - Re: [PATCH] i2c: aspeed: do not mask SLAVE

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Message-ID: <YpmgzroKbMO3TIsY@apples>
Date:   Fri, 3 Jun 2022 07:49:02 +0200
From:   Klaus Jensen <its@...elevant.dk>
To:     linux-kernel@...r.kernel.org
Cc:     Brendan Higgins <brendanhiggins@...gle.com>,
        linux-i2c@...r.kernel.org, openbmc@...ts.ozlabs.org,
        Wolfram Sang <wsa@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Klaus Jensen <k.jensen@...sung.com>
Subject: Re: [PATCH] i2c: aspeed: do not mask SLAVE_MATCH

On Jun  2 07:48, Klaus Jensen wrote:
> From: Klaus Jensen <k.jensen@...sung.com>
> 
> When commit f9eb91350bb2 ("i2c: aspeed: added slave support for Aspeed
> I2C driver") added slave mode support, the SLAVE_MATCH interrupt bit
> (bit 7) was not added to INTR_ALL and so will never be set by the Aspeed
> I2C controller.
> 
> Fixes: f9eb91350bb2 ("i2c: aspeed: added slave support for Aspeed I2C driver")
> Signed-off-by: Klaus Jensen <k.jensen@...sung.com>
> ---
> I am working on slave mode in QEMU and noticed that the device would not
> generate the SLAVE_ADDR_RX_MATCH interrupt. This patch fixes it, but I
> do not have a spec sheet on the Aspeed, so I am not sure if this is the
> intended behavior?
> 
>  drivers/i2c/busses/i2c-aspeed.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/i2c/busses/i2c-aspeed.c b/drivers/i2c/busses/i2c-aspeed.c
> index 771e53d3d197..7f432babcd72 100644
> --- a/drivers/i2c/busses/i2c-aspeed.c
> +++ b/drivers/i2c/busses/i2c-aspeed.c
> @@ -86,6 +86,7 @@
>  #define ASPEED_I2CD_INTR_ALL						       \
>  		(ASPEED_I2CD_INTR_SDA_DL_TIMEOUT |			       \
>  		 ASPEED_I2CD_INTR_BUS_RECOVER_DONE |			       \
> +		 ASPEED_I2CD_INTR_SLAVE_MATCH |				       \
>  		 ASPEED_I2CD_INTR_SCL_TIMEOUT |				       \
>  		 ASPEED_I2CD_INTR_ABNORMAL |				       \
>  		 ASPEED_I2CD_INTR_NORMAL_STOP |				       \
> -- 
> 2.36.1
> 

I've been informed that SLAVE_MATCH should always be generated,
regardless of INTR_CTRL, so please ignore this patch.

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